CREATE TABLE t1(f1 INT, f2 INT, INDEX(f1))ENGINE=InnoDB
PARTITION BY LIST(f1) (
PARTITION p1 VALUES in (1, 2, 3),
PARTITION p2 VALUES in (4, 5, 6));
INSERT INTO t1 VALUES(1, 1), (1, 1), (6, 1);
connect con1,localhost,root,,,;
START TRANSACTION WITH CONSISTENT SNAPSHOT;
connect con2,localhost,root,,,;
SET DEBUG_SYNC="innodb_rollback_inplace_alter_table SIGNAL default_resume WAIT_FOR alter_resume";
ALTER TABLE t1 ADD UNIQUE INDEX(f1);
connection default;
set DEBUG_SYNC="now WAIT_FOR default_resume";
SET DEBUG_SYNC="innodb_row_update_for_mysql_begin SIGNAL alter_resume WAIT_FOR alter_finish";
DELETE FROM t1;
connection con2;
ERROR 23000: Duplicate entry '1' for key 'f1_2'
SET DEBUG_SYNC="now SIGNAL alter_finish";
connection default;
connection con1;
commit;
connection default;
disconnect con1;
disconnect con2;
InnoDB		0 transactions not purged
drop table t1;
SET DEBUG_SYNC=reset;